> Generaly speaking, what we realy need is to change the nodes 
 > of FO tree at 'runtime' depending on some 'formatting events' 
 > generated by formatter, right?  I may want to change the color of 
 > the header if there is a Table on the page ( and only in this case). 
 > Right? ;-) 

yes, good example. or one may want to omit the running head if the
page is entirely occupied by floats.

Sebastian


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